问题
选择题
Every possible means _______ been taken to prevent the river _________.
A．have; polluting
B．has; polluted
C．has; from being polluted
D．have; being polluted
答案
答案：C
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Every possible means _______ been taken to prevent the river _________.
A．have; polluting
B．has; polluted
C．has; from being polluted
D．have; being polluted
答案：C